- Acanthephyra pelagica
- Acanthephyra purpurea
- Acanthomysis longicornis
- Actinotrocha branchiata
- Actinotrocha hippocrepia
- Actinotrocha pallida
- Actinotrocha sabatieri
- Aequorea forskalea
- Aequorea macrodactyla
- Aequorea vitrina
- Agalma elegans
- Aglantha digitale
- Alaurina composita
- Alciopa reynaudii
- Alloteuthis medius
- Alloteuthis subulatus
- Amblyops abbreviata
- Amblyops kempi
- Amphinema dinema
- Amphinema rugosum
- Anchialina agilis
- Apolemia uvaria
- Appendicularia sicula
- Arachnactis albida
- Architeuthis dux
- Asterias rubens
- Asterope abyssicola
- Athanas nitescens
- Atolla wyvillei
- Aurelia aurita
- Bassia bassensis
- Bentheuphausia amblyops
- Beroe cucumis
- Beroe gracilis
- Bodotria arenosa
- Bodotria pulchella
- Bodotria scorpioides
- Bolinopsis infundibulum
- Boreomysis arctica
- Boreomysis megalops
- Boreomysis microps
- Boreomysis tridens
- Boroecia borealis
- Boroecia maxima
- Bosmina longispina
- Bougainvillia britannica
- Bougainvillia macloviana
- Bougainvillia muscoides
- Bougainvillia muscus
- Bougainvillia principis